1 October 1991 A quasi-optical power combining array with externally injection-locked elements
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Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 157640 (1991) https://doi.org/10.1117/12.2297857
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland
Abstract
Recently, quasi-optical power combining arrays using FETs have been demonstrated [1,2], where the active elements are distributed on a plane between partially reflecting dielectric slabs. Spatial injection locking is achieved by illuminating the array with a plane wave; locking bandwidths are typically low.

In this paper, we demonstrate a new type of power combining array using two-port FET oscillators as the active elements [3]. The oscillators are arranged in a square planar array, with the output of each connected to a patch radiator. The key difference between this approach and the work cited above is that the oscillators are injection locked to a single external source by means of a Wilkinson-type 16 way power divider, rather than by parasitic coupling between the oscillating elements.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joel Birkeland, Joel Birkeland, } "A quasi-optical power combining array with externally injection-locked elements", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 157640 (1 October 1991); doi: 10.1117/12.2297857; https://doi.org/10.1117/12.2297857
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